Provided is a novel method for producing a monoglycoside of resveratrol. The method for producing a monoglycoside of resveratrol according to the present invention comprises allowing a protein or the like consisting of the amino acid sequence of SEQ ID no: 1 to act on a system comprising resveratrol and a saccharide. According to this preparation method, the resveratrol 4-O-a-glycoside represented by formula (1) can be obtained. In the formula, R1 represents a sugar residue attached at the a position. TIFF20231815890014.tif47134

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